In regards to the Splunk App for VMware, as of July 2016, the Splunk App for VMware has now been divided into three products:
The Splunk App for VMware
The Splunk Add-on for VMware - Contains the distributed collection scheduler. Also contains the Collection Configuration page now that allows you to connect DCNs and virtual centers
Splunk OVA for VMware - A package of technologies that deploys a Splunk forwarder that serves as a Data Collection Node for sending data to the Splunk App and Add-on for VMware, as well as the Virtualization Module for Splunk IT Service Intelligence.
Splunk Add-on for VMware and Splunk OVA for VMware are meant to work with both the Splunk App for VMware, as well as the Splunk ITSI Virtualization module.
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